Portion of a shoe



FIG. 1 is a front perspective view of a portion of a shoe showing my new design;

FIG. 2 is a rear perspective view thereof; and,

FIG. 3 is a side view thereof.

The uneven broken lines immediately adjacent to the shaded areas represent unclaimed boundaries of the design. The broken line showing of the trademark within the claimed region and of the remainder of shoe is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a shoe, as shown and described. 